Sand cutter



vApril 30, 1929. N. w. 'sTRATl-onn 1,711,104

SAND CUTTER Filed Dec. 4, 1926 2 Sheets-Sheet4 1 y M @@@g-.f

Apl 30, 1929. N. w. sTRATFoRD SAND CUTTER Filed Des. 4, 1926 .2,Sheets-Sheet 2 jive/2257 Patented pr. 30, 1929.

UNITED STATES PATENT OFFICE.

NATHANIEL WALTER STBATFORD, OF CHICAGO, ILLINOIS, ASSIGNOR TO THEBEABDS- LEY & :PIPER COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

SAND CUTTER.

Application filed December 4, 1926. lSerial No. 152,552.

The invention relates to machines known as sand cutters of the characterused in foundries in conditioning sand7 preparatory to deliver-ing itinto moulds. l

Une object of the invention is to provide an iinproved ronstruction inwhich the cylinder or druni is provided with elements for projecting orthrowing sand froni a hopper or receptacle, which are durable and arenot likely hoolr into or positively engage scrap eastings oftentiinespresent in the sand, and this object is attained by providing .elementson the cylinder which have their active portions foi-ined of loops ofWire for this purpose.

Another object of the invention is to provide a construction of thischaracter which niay be readily and conveniently applied 'to the drinn,and this object attained by utilizing' a. continuous flexible wire coilhelically wdund around the druni and secured thereon.

Another object is to provide nieans whereby lthe coil inay be detaohablyand conveniently secured to the body of the drum or cylinder.

Another object o f the invention is to provide yielding ineans coactingwith the cylinder, such as coil springs having free ends terminatingadjacent the throwing elements on the cylinder, for lin'iitiiig thedischarge of sand. Surh springs are durable and may be secured so theyiuay be readily replaced.

Other objects of the invention will appear frein the detail description.

The invention consists in the several novel features hereinafter setforth and more particularly delined by claims at the conclusion hereof.

In the drawings: Fig. l is transverse section of a niachineeinbodyingthe invention. Fig. Q is a side-elevation. 3 is a longitudinal section.Fig. 4 is a detail of the bodv of the cylinder or drinn. Fig. 5 is aplan, parts being omitted.

The invention is exemplified in a sand cutter of the wheel-cart typewhich may be inoved around to discharge the sand wherever desired andcomprises a pair of carryingwheels l0 which support and are rotatable ona shaft 1l; a frame or structure comprising side-brackets 12, throughwhich the shaft 11 extends, and in which the shaft is lined againstrotation, and a pair of tubular handles 13 which are clamped in thebrackets 12 respectively and by which the operator may move the machineto the desired point of operation; legs l-t secured to the handles; areceptacle or hopper l5 secured to and supported by brackets l2; and acylinder for discharging the sand froin the hopper for the purpose ofdisintegrating and distributing it. The cylinder comprises sand-throwingelements and a hollow cylindrical drinn or east body 16 on which theelements are secured. At either end, the body 1G is removably secured,by bolts 17, to heads i8 whichclose the ends of, and

sup port7 the cylinder. Said heads are carried by roller-bearingsl)around the shaft ll and rotatably support the cylinder so that thelatter may rotate around said shaft.` The inner ring it);1 of each ofsaid bearings is held by nuts i9" which are threaded to the shaft l1.Caps 2l), removably secured by bolts 2l tothe heads 18, enclose theouter ends of bearings 19 and each has a gasket 22 fitting around shaftll to prevent sand froi'n entering the bearings. This exemplifies acylinder which is rotatable about a stationary shaft or axle and has itsends and its bearings completely enclosed to prevent the entry of sandinto the cylinder.

'lhe cylinder is directly driven by an elec-1 tric inotor which isdisposed inside of, and enclosed by, the body of the cylinder, so thatgearing will be dispensed with. rlhe electric inotor is of the inductiontype and comprises the flow of current through the armature will rotatethe fields and drive the cylinder. A cable of conduct-ors 29, forsupplying current to the armature 25, leads therefrom through a radialopening 30 which lea-ds to a longitudinal passage 31 in the shaft 1l.Said passage extends to one end of said shaft. A socket 32 is secured bya screw 32 to said end of the shaft. The wires 29 are connected to, andterminate at, contact-strips 32 which are insulated froin one anotherand secured in socket- 32. The latter is adapted to detachably receive asuitable connection-plug which is suitably connected to a source ofcurrent. This exemplitiesa construction `in which the electric motor fordriving the cylinder is mounted 'inside of, and enclosed within, thecylindei5-wliich 'dispenses with gearing between the inotor and thecylinder; in which the fields ot' the motor are secured directly in thecylinder body to drive the cylinder7 and in which the conductors enterthe cylinder through the stationary motor-shalt.

`In practice, itis desirable to providesandthrowing elements which aredurablc,will not becomeln'olzen,` andiniay be easily replaced when wornout. It frequently occurs that piecesioi scrap-or castings are presentinthe .sand shovelled` into the hopper l5, which,

when rigid teeth or `points'are `used for pro-- jecting the sand,are-caughtby the teeth and projectedwithgreat torce thereby, resultinginbreakingor damaging the teeth or damage causediby the projectedcastings. To provide the.` cylinder withn throwing elements whichwilllnieet these desiderata, the inve lion p ro vides elements whichconsist ot' a series ot loopsor ring-like elements 34, the outer arcuate portions of which engage the sand and are yieldable For theconvenience ol producing and conjointly applying said elements, they are`torined of the` loops or conmln tions ola lengthota coil oi'iwvire. Thecoil is spirally` Wound around the outer periphery o `the cylinder-body16 `wliichis orniedwith a spiralconcave/seat for the inside oit thecoil. This coilis secured to the cylinderbody and in the groove 36 by asteel-cable 37 which is threaded through the coil and has its` endsanchored` to bolts 39 which pass through lugs. 38 .integrally formed onthe outer periphery of the cylinder body lG and adjacent its endsrespectively. The outer ends of said bolts `have nutselOii whereby thecable 1 tends out-wardlyf beyond the coil and longitudinal/ly inwardAwhere it terminates in a tlangeiel-' which isgadapted to prevent thesand from tlowing endwise out ot' the hopper l5. Upoirrenioval of therings 42j the anchorages Ltor the cable will be accessible so that thecoil may he removed and replaced when desired. rThis exelnpl'iiliesthrowing or projecting a cylinder having its periphery provided withvieldable loops for engaging the sand. Thus `termed. the elements aredurable and avoid damage which results from the forcible proiectionf ofcastlnsrs and the like which are in the sand. lt also exemplifies aconstruction of this type et throwing elements, in which the entireseries inay be applied a unit and conveniently secured to thecylinder-body.

The hopper l5 comprises inclined walls l5 and sides l5" TYYhich arepreferably liared upwardly, so that sand inay be shovelled into thehopper with teeility, and. a :liront wall 15C. .if-lt that cud ot thehopper troni which the sand is te be discharged, a transverse bar delsecured by' bolts d8 to brackets l2, and Y a bar 4-5 entends across barLlll and is secured thereto by bolts 1l?. These bars have verticallyextending recesses i9 to receive and hold between thein a series et coilsprii'igs 46 which have tree lower ends terminating adjacent theelements 3ft, to prevent an exo'l' sand frein being discharged by thethrowiiig elements and to coact with said eleinents in disintegratingtho sand. The upper ends of sprii Il renier/ably clamped between barsdel and l5 by bolts 47.

The operation 'will be as :tollows Sand will be slioveiled or otherwisedelivered into the hopper l5. llllhen current supplied to the electricnieto' in the cylinder, the latter will be rapidi A ted so the outerportions oithe elements hrow sand Ll'roni the bottoni ci' the l'iopperonto), and distribute it over, the i'loor to cut i- 'i Springs i6 willref' he hopper to prevent en cxg' :.iischsrged by the throwing is not tobe understood as respirit and scope ol the invention.

Having thus described the invention.V what .l claim as new and desire tosec irc by Letters Patent. is: l

l. In e send cutter` 'the combination ot a.

traine, a c lander rotatably mounted in the traine, said holding nieaus,esiiient loops ruler for throwing sand, and ineens tor driving thecylinder.

ln c. sand cut-ter, the combination ot sand-holding n'ieens, and drivenmeans' provided with a wire coil tor throwingA sund :from the holdingineens.

3. In a sand cutter` the :onibination oil" a sand receptacle, and adriven cylindewbody provided with a wire coil tor throwing .sand fromthe receptacle. l

,ln a sand cutter. the conibinatifai et' sanddiolding ineensT out;driven means provided with i' '.1 Vlent re :foil tur throwing sar-.d'treni the hoidr ineens.

in a sand cuties. the combination nl a sand receptacle? and drivencylEnder-body provided with a resilient wire coilr :for throwing sand'troni the receptacle.

6. A cutter element tor a sand cutter, coinprising a drivencylinder-body and a wire coil -tor throwing the sand, spirally woundaround the body.

lll)

lill) 7. In a sand cutter, the combination of a sand receptacle, adriven cylinder-body, and a resilient wire coil spirally wound aroundthe body, for throwing sand from the receptacle.

8. In a sand cutter, the combination of sand holding means, a drivencylinder-body, a wire coil i'or throwing sand, spirally wound around thebody, and means for removably securing the coil on the periphery of thebody.

9. In a sand cutter, the combination of sand holdingl means, acylinder-body having i a groove in its periphery, a wire coil forthrowing sand, secured in said groove, and means tor driving thecylinder.

l0. In a sand cutter, the combination ot a cylinder-body, having aspiral groove in its periphery, a wire coil for throwing sand, securedin said groove, sand holding means, and means for driving the cylinder.

ll. In a sand cutter, the combination ot sand holding means,` acylinder-body having a groove in its periphery, a wire coil for throwingsand, and a cable threaded through the coil for securing it on the body.

12. In a sand cutter, the combination of sand-holding means, a drivencylinder-body having a spiral groove in its periphery, a nire coil forthrowing sand seated in said groove, and a cable threaded through thecoil :for securing it in the groove.

1&3. In a sand cutter, the combination ot a cylinder body, throwingloops on the body, removable rin extending from the end portions of thebody to enclose the loops at the ends of the body, and means for drivingthe cylinder.

la. In a sand cutter, the combination of a traine. a shaft in the frame,a cylinder-body rotatable around the shaft, a wire coil secured on theperiphery ot' the cylinder, removable rings extended from the endportions of the periphery of the cylinder to enclose the outer sides oi"the ends oi the coil, a receptacle for sand carried by the frame, andmeans for driving the cylinder.

l5. In a sand cutter, the combination ot a frame, a cylinder-body on theshalt, a wire coil spirally wound around the periphery of the cylinder,a cable threaded through the coil, attaching lugs for the cable on thebody, removable rings enclosing the lugs and ends ot' the coil, a. sandreceptacle carried by the frame, and means for driving the cylinder.

I6. In a sand cutter, the combination of a sand receptacle, a drivencylinder provided with elements on its periphery for throwing sand, anda series of coil-springs on the receptacle having their free endsextending to said elements and positioned to confine yielding-ly thesand in the receptacle.

17.111 a sand cutter, the combination of a sand receptacle, a 'drivencylinder provided with elements on its periphery for throwing sand, aseries of coil springs on the receptacle having their free endsextending to said elements and positioned to confine ieldingly sand inthe receptacle, and means or clamping the other en s of the springs tohold them in operative position.

18. In a sand cutter, the combination of a sand receptacle, a rotatablecylinder positioned to contact with the sand, and loops substantiallycovering the periphery of the cylinder, said loops being operative,during rotation of said cylinder, to cut the sand.

19. In a sand cutter, the combination of a sand receptacle, a rotatablecylinder positioned to contact with the sand, an annular series of loopsextending around the periphery of the cylinder and operative, duringrotation of said cylinder, to cut the sand.

20. In a sand cutter, the combination of a sand receptacle, a rotatablecylinder positioned to contact with the sand, and loops arranged inannular series around the periphery of the cylinder, said loops beingoperative, 'during rotation of the cylinder, to cut the sand.

21. In a sand cutter, the combination of a sand receptacle, a rotatablecylinder posi-` tioned to contact with the sand, and resilient loopssubstantially covering the periphery ot' thc cylinder and operative,during rotation of said cylinder, to cut the sand.

22. In a sand cutter, the combination of a sand receptacle, a rotatablecylinder positioned to contact with the sand, and a continuous series ofloops wrapped around the periphery of the cylinder, said loops beingoperative, during rotation of the cylinder, to cut the sand.

23. In a sand cutter, the combination of` a sand receptacle, a rotatablecylinder to contact with the sand, and a continuous series of loopswrapped spirall around the periphery of the cylinder, sai loops beingoperative, during rotation of the cylinder, to cut the sand.

24. In a sand cutter, the combination of means for delivering sand, arotatable cylinder positioned to receive sand from said delivery means,and loops substantially covering the periphery of the cylinder, saidloops being operative, during rotation of said cylinder, to throw thesand.

25. In a cutter mechanism of the character described, the combination ofa sand hopper having a discharge opening at the bottom thereof anddriven means positioned adjacent the discharge opening, andsubstantially covered with loops for throwing the sand as it isdischarged from said opening.

26. A sand cutter element for a mechanism of the character described,said element comprising a body and resilient wire coil mounted on thebody for throwing the sand.

Signed at Chicago, Illinois, this 19th day of November, 1926.

NATHANIEL WALTER STRATFORD.

